Ultralight intensive objective



35o-472 5R MU iff/UME 0R 1.899.934 ,4971.991 www nz.

2 5. 53"/ March 7, 1933. M. BEREK 1,899,934

ULTRALIGHT INTENSIVE OBJECTIVE Filed July 2o, 1932 l (Q D 5/ ,m9

INVENTOR e'm l( ATTORN EY Patented Mar. 7, 1933 UNITED STATES PATENT OFFICE MAX BEREK, OF WETZLAR, GERMANY, ASSIGNOR TO ERNST LEITZ, OPTISCHE WERKE,

G. M. B. H., OF WETZLAR, GERMANY ULTRALIGHT IN TEN SIVE OBJECTIVE Application led J'uly 20, 1932, Serial No. 623,554, and in Germany June 6, 1931.

This invention relates to improvements in objectives with an ultra-high light intensity.

The known objectives of this kind allow by means of a triplet construction having six faces only exposed to the air the production of an anastigmatically level picture field free of coma and traces of a relatively large extent with great light intensity.

According to my invention I obtain by splitting the front members of the objectives described in above systems, systems of the highest light intensity. In order to avoid simultaneously a stronger vignetting in the required picture angle, the airl spaces must fulfill certain conditions for obtaining the results according to the prior construction of objectives, and these conditions together with part of the prior construction of objectives form the object of the present invention.

In the accompanying drawing forming a material part of this disclosure:

Fig. 1 shows the preferred construction of an objective according to my invention.

Fig. 2 is a similar view of a modified form of objective.

As the corresponding data of construction for the objective according to Figure 1 are:

da=5.349 1.5673 42.8 n =+33.963 fo =+62.846 Ua=12.034 1.0

de=4.457 1.5407 47.2 no=+54.734

It will be understood that I have disclosed the preferred forms of my invention as eX- amples only of the many possible ways to practically construct the same, and that I 6o may make such changes therein as come withinthe scope of the appended claim without depart-ure from the spirit of my invention and the principles involved.

v`Having thus described my invention, what I claim as new and desire to secure by Letters Patent-is:

An objective of ultralight intensity with light surfaces exposed to air comprising two positive members in consecutive order separated by an air space, a following negative member-and a positive rear member, the negative member consisting of a positive and a negative element which are cemented together, and present collective cement faces, so that the 'f1/D difference at the cement face in the negative member is at least 0.05, and at this cement face the value is MAX BEREK. 

